Spot-beam frequency re-use techniques for broadcast satellites
Abstract
Point-to-multipoint or broadcast satellite systems are discussed wherein each up-link message unit is intended for reception at several receiving sites geographically dispersed over some wide-service area. It is noted that for such a system the total up-link and down-link transmission requirements, defined respectively as the sum of the source information rates and the sum of the destination information rates, are different. On the assumption that not all up-link messages are to be received at every receiving site, it is shown that multiple spot-beam frequency-reuse techniques can be applied to provide more efficient down-link power utilization and increased flexibility to accommodate dynamic changes in source-destination traffic patterns compared against area coverage broadcast satellites. Up-link message-source and down-link message-destination matrices are developed as vehicles for ascertaining both the up- and down-link transmission capacity requirements and the minimum required down-link power. From this, a multiple scanning beam digital broadcast satellite operating in the time-division mode and employing onboard regeneration is proposed and demonstrated to be minimum power realization.
- Publication:
-
ICC 1980; International Conference on Communications, Volume 3
- Pub Date:
- 1980
- Bibcode:
- 1980icc.....3...58A
- Keywords:
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- Broadcasting;
- Communication Satellites;
- Downlinking;
- Frequency Assignment;
- Time Division Multiplexing;
- Uplinking;
- Antenna Radiation Patterns;
- Data Transmission;
- Digital Systems;
- Message Processing;
- Point To Point Communication;
- Satellite Transmission;
- Transmission Efficiency;
- Transponders;
- Communications and Radar